CN106301720B

CN106301720B - Method and device for transmitting uplink control information

Info

Publication number: CN106301720B
Application number: CN201510246773.2A
Authority: CN
Inventors: 李迎阳; 王轶; 付景兴; 张世昌
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2015-05-14
Filing date: 2015-05-14
Publication date: 2020-08-21
Anticipated expiration: 2035-05-14
Also published as: US10158461B2; CN106301720A; EP3259867A1; EP3259867A4; CN112187432A; EP3259867B1; EP3998737A1; US20160338041A1; WO2016182406A1

Abstract

The application discloses a method for transmitting uplink control information UCI, which is characterized by comprising the following steps: the method comprises the steps that User Equipment (UE) receives signaling for configuring an alternative PUCCH channel set corresponding to an ACK/NACK resource indication (ARI); UE receives a downlink authorization signaling and corresponding downlink data to generate HARQ-ACK bits; the UE processes UCI bits including HARQ-ACK and transmits on the PUCCH channel indicated by the ARI. The present application also discloses a method for transmitting aperiodic CSI information (a-CSI), which is characterized by comprising: user Equipment (UE) receives an uplink authorization signaling; the UE determines whether to trigger an A-CSI report currently according to a CSI request domain in an uplink authorization signaling; the UE determines a CSI process to be updated and transmits A-CSI information on an uplink CC carrying an A-CSI report.

Description

Method and device for transmitting uplink control information

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting Uplink Control Information (UCI) on an uplink channel in an LTE carrier aggregation system.

Background

In a Long Term Evolution (LTE) system, a downlink and an uplink of a communication system, i.e., a Carrier Aggregation (CA) technique, are constructed by combining a plurality of Component Carriers (CCs) to obtain a larger operating bandwidth, thereby supporting a higher transmission rate. Up to now, various types of CA have been supported, namely: the cells to be aggregated may all be FDD cells, or may all be TDD cells, and the TDD uplink and downlink configurations of the TDD cells are the same, or may all be TDD cells, but the TDD uplink and downlink configurations of the TDD cells are different, and in addition, aggregation of the FDD cell and the TDD cell is also supported, and the uplink and downlink configurations of the TDD cell may be semi-statically configured or dynamically changed.

For one UE, when the CA mode is configured, one cell is a primary cell (Pcell), and the other cells are called secondary cells (scells). According to the LTE method, downlink data are transmitted to the Pcell and the Scell based on a hybrid automatic repeat request (HARQ) mechanism, and correspondingly, the UE needs to feed back HARQ-ACK information of a plurality of cells. For a cell of an FDD system, only HARQ-ACK information of data in a downlink subframe needs to be fed back in an uplink subframe; for a cell of a TDD system, when downlink subframe data in a frame structure of the cell is more than uplink subframes, HARQ-ACK information of data in a plurality of downlink subframes generally needs to be fed back in one uplink subframe, and the plurality of downlink subframes are referred to as a bundling window corresponding to the uplink subframe. For example, the size of the bundling window for an LTETDD cell may be 1, 2, 3, 4, or 9. According to the LTE method, HARQ-ACK information of all configured cells is fed back on one PUCCH channel of the Pcell. In addition, periodic channel state indication (P-CSI) of each cell is also mapped to a Pcell for transmission, and non-periodic CSI (A-CSI) is mapped to a Physical Uplink Shared Channel (PUSCH) for transmission.

According to the LTE approach, Physical Uplink Control Channel (PUCCH) format 3 is currently supported, the basic idea being to jointly encode and map multiple UCI bit information, e.g. HARQ-ACK bits, Scheduling Request (SR) and/or P-CSI information from multiple configured cells, to a physical channel transmission. PUCCH format 3 can support transmission of 22 bits at most. As shown in fig. 1, it is assumed that RM coding is adopted, and UCI bits are modulated to obtain 24 QPSK symbols after RM channel coding and scrambling, and are mapped to uplink resources of one PRB for transmission. Wherein, the first 12 QPSK symbols are mapped to the first slot of PUCCH format 3 for transmission, and the last 12 QPSK symbols are mapped to the second slot of PUCCH format 3 for transmission. Here, PRB positions mapped in two slots for one PUCCH format 3 channel are mirror-image with respect to a center frequency, thereby obtaining a frequency diversity gain. Taking the first slot as an example, the 12 QPSK symbols are mapped to 5 symbols of the first slot after being multiplied by each element of an orthogonal spreading code (OCC) with a length of 5.

Currently, the 3GPP standardization organization is standardizing the enhanced CA technology for aggregating more cells, for example, the number of aggregated cells can reach 32. In this case, for one UE, all configured cells may be divided into a plurality of Cell Groups (CGs), or only one CG may be provided; and for each CG, feeding back UCI information on a PUCCH of a cell respectively, wherein the cell feeding back UCI is similar to Pcell in the prior CA technology. Here, the number of cells per CG may still exceed the maximum number of aggregated cells supported by the existing CA technology. Here, when the number of configured cells is large or the size of the bundling window is large, the number of HARQ-ACK bits that the UE needs to feed back is large, for example, larger than 22 bits. In addition, when the number of configured cells is large, the CSI information that the UE needs to feed back is correspondingly increased. In addition, the UE may also need to transmit a Scheduling Request (SR) in the uplink direction. E.g., greater than 22 bits. Accordingly, in order to support UCI transmission of more than 22 bits, a new PUCCH format needs to be defined. Since the PUCCH format X is introduced, a series of influences are necessarily brought, and accordingly, a specific transmission method for UCI needs to be designed.

Disclosure of Invention

The application provides a method and equipment for transmitting UCI, which can support the transmission of the UCI with more than 22 bits and realize the transmission of more efficient A-CSI information.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a method for transmitting Uplink Control Information (UCI), comprising:

user Equipment (UE) receives a configuration signaling and determines an alternative PUCCH channel set corresponding to an ACK/NACK resource indication (ARI);

UE receives a downlink authorization signaling and corresponding downlink data to generate HARQ-ACK bits;

and the UE processes UCI bits including HARQ-ACK, determines a PUCCH channel for UCI bit transmission from the alternative PUCCH channel set according to ARI included in the downlink authorization signaling, and transmits the UCI bits on the determined PUCCH channel.

Preferably, when the UCI bits are transmitted on a PUCCH channel of PUCCH format X, the UE processing and transmitting the UCI bits on the PUCCH channel includes:

the UCI bits are encoded, Rate Matched (RM), scrambled and then written into (R)_mux×C_mux) Matrix, then read out column by column, and read out the front C_mux,0Column mapping to the first slot, C, of the PUCCH format X channel_mux,1Column mapping to a second slot of the PUCCH format X channel; then, for each time slot, mapping the time slot to the SCFDMA symbol after OCC expansion;

wherein, the (R) is determined according to the number of SCFDMA symbols and the OCC length of the PUCCH format X_mux×C_mux) Number of columns C of matrix_muxAnd determining the number of rows R according to the number of modulation symbols supported by the PUCCH format X channel to be transmitted and the number of physical bits allowed to be carried by each modulation symbol_mux，C_mux,0+C_mux,1＝C_mux。

Preferably, when the P-CSI is included in the UCI bits, the UCI bits including the P-CSI are transmitted on a PUCCH channel indicated by the ARI.

Preferably, the determining the PUCCH channel according to the ARI includes: after the ARI information and other control information are processed together, mapping the processed ARI information and other control information to TPC domains of other downlink authorization signaling except the TPC domain of the downlink authorization signaling still used for power control of the Pcell; and determining the PUCCH channel according to the ARI information mapped on the corresponding TPC domain.

Preferably, the mapping of the ARI information and other control information includes: the TPC domain of one downlink authorization signaling on the Pcell is still used in other downlink authorization signaling except for power control, the TPC domain in the first N continuous downlink authorization signaling sent by the base station is used for mapping ARI information, and the TPC domain in the rest downlink authorization signaling is used for mapping the other control information; wherein N is an integer of 4 or more.

Preferably, the mapping the other control information by the TPC field in the remaining downlink grant signaling includes:

utilizing the TPC domain in the remaining downlink authorization signaling to bear the total number of the downlink authorization signaling currently scheduled by the base station;

or, the total number of the currently scheduled TBs of the base station is carried by using the TPC field in the remaining downlink grant signaling.

Preferably, the total number of the downlink grant signaling or the total number of the TBs is counted in a time domain, a frequency domain, or a combination of the time domain and the frequency domain.

Preferably, the determining the PUCCH channel according to the ARI includes:

the UE determines a PUCCH channel according to the ARI information and selects a PUCCH format according to the number of bits of UCI; or,

the UE determines a currently used PUCCH format and a corresponding PUCCH channel according to the value of the ARI; and the formats of different alternative PUCCH channels in the alternative PUCCH channel set are the same or different.

An apparatus for transmitting Uplink Control Information (UCI), comprising: the device comprises an alternative PUCCH channel set determining unit, an HARQ-ACK bit generating unit, a UCI bit processing unit, a PUCCH channel determining unit and a transmitting unit;

the alternative PUCCH channel set determining unit is used for receiving the configuration signaling and determining an alternative PUCCH channel set corresponding to an ACK/NACK resource indication (ARI);

the HARQ-ACK bit generating unit is used for receiving the downlink authorization signaling and the corresponding downlink data and generating HARQ-ACK bits;

the UCI bit processing unit is used for processing UCI bits including HARQ-ACK;

the PUCCH channel determining unit is configured to determine a PUCCH channel used for UCI bit transmission from the candidate PUCCH channel set according to the ARI included in the downlink grant signaling;

and the sending unit is used for transmitting the UCI bits on the determined PUCCH.

A method of transmitting aperiodic CSI information (a-CSI), comprising:

user Equipment (UE) receives an uplink authorization signaling;

the UE determines whether to trigger an A-CSI report currently according to a CSI request domain in an uplink authorization signaling;

after determining to trigger the A-CSI report, the UE determines a CSI process to be updated and transmits A-CSI information on an uplink CC carrying the A-CSI report.

Preferably, the determining whether to trigger the a-CSI report according to the CSI request field in the uplink grant signaling includes: for the CC only configured with downlink transmission, the UE determines whether to trigger an A-CSI report by detecting a DCI format 0; the CSI request field of DCI format 0 is used to trigger an a-CSI report of a CC configured only for downlink transmission by a UE.

Preferably, for a CC configured only for downlink transmission, when determining to trigger an a-CSI report according to the DCI format 0, the uplink CC carrying the a-CSI report is: and the uplink CC indicated by the specified bit in the PCell, the PScell or the DCI format 0.

Preferably, for a CC configured for downlink transmission only:

configuring a CSI process triggered by the value of each CSI request field of the DCI format 0 by using independent high-layer signaling;

and/or, using information larger than 2 bits in the DCI format 0 as the CSI request field;

and/or, the transmitting the a-CSI information on the uplink CC carrying the a-CSI report includes: when the UE does not schedule uplink data transmission on an uplink CC carrying an A-CSI report, determining parameters of a PUSCH (physical uplink shared channel) of the uplink CC according to the DCI format 0 and transmitting the A-CSI; when the UE schedules uplink data transmission on the uplink CC and does not trigger other A-CSI reports, sending a PUSCH and transmitting the A-CSI according to an uplink authorization signaling of the uplink CC; and when the UE detects the uplink authorization signaling on the uplink CC and triggers another A-CSI, the UE only transmits the A-CSI triggered by the uplink authorization signaling of the uplink CC, or the UE simultaneously feeds back two A-CSI reports.

Preferably, the determining the CSI process to be updated comprises:

when the A-CSI of a plurality of CG is triggered in one subframe, and the total number N of triggered CSI processes is larger than the capability K of the UE for updating and reporting the A-CSI, the UE selects K CSI processes with the highest priority from the N CSI processes to update the CSI and report.

Preferably, the determining the priority according to different CSI processes includes:

the priority of the CSI process which simultaneously feeds back RI and CQI/PMI is higher than that of the CSI process which only feeds back CQI/PMI by adopting default RI; and/or the presence of a gas in the gas,

determining the priority of the corresponding CSI process according to the priorities of various predefined CSI reporting modes for A-CSI; and/or the presence of a gas in the gas,

determining the priority of the corresponding CSI process according to the predefined priorities of various downlink transmission modes; and/or the presence of a gas in the gas,

determining the priority of the CSI process according to the CSI process ID; and/or the presence of a gas in the gas,

respectively configuring unique cell IDs for all CCs configured for the UE, and determining the priority of a CSI process according to the cell IDs; and/or the presence of a gas in the gas,

configuring cell IDs for all CCs configured for the UE, wherein the cell IDs are indexes of cells in a CG, and determining the priority of a CSI process according to the cell IDs; and/or the presence of a gas in the gas,

determining the priority of the CSI process according to the CG index; and/or the presence of a gas in the gas,

when one CG is divided into a plurality of subgroups feeding back A-CSI, determining the priority of a CSI process according to the indexes of the A-CSI subgroups; and/or the presence of a gas in the gas,

determining the priority according to whether the cell bears UCI information or not, wherein the priority of the Pcell is higher than that of the PScell, and the priority of the PScell is higher than that of other Scell; and/or the presence of a gas in the gas,

the priority of the CSI process of the licensed frequency band cell is higher than that of the CSI process of the unlicensed frequency band cell, or the priority of the CSI process of the unlicensed frequency band cell is higher than that of the CSI process of the licensed frequency band cell;

preferably, when the K CSI processes with the highest priority are selected, only CSI information of the CSI processes belonging to the K CSI processes with the highest priority is reserved for one a-CSI report of one CG, and the total bit number of the a-CSI information is determined accordingly.

An apparatus for transmitting aperiodic CSI information (a-CSI), comprising: the device comprises a receiving unit, an A-CSI report triggering unit and a transmission unit;

the receiving unit is configured to receive an uplink grant signaling;

the A-CSI report triggering unit is used for determining whether to trigger an A-CSI report currently according to a CSI request domain in the uplink authorization signaling and notifying the transmission unit when determining to trigger the A-CSI report;

and the transmission unit is used for determining the CSI process to be updated and transmitting the A-CSI information on the uplink CC carrying the A-CSI report after receiving the trigger notice of the A-CSI report trigger unit.

According to the technical scheme, the UE receives the configuration signaling and determines the alternative PUCCH channel set corresponding to the ACK/NACK resource indication (ARI); UE receives a downlink authorization signaling and corresponding downlink data to generate HARQ-ACK bits; the UE processes UCI bits including HARQ-ACK and transmits on the PUCCH channel indicated by the ARI. Through the above process, UCI transmission of more than 22 bits can be supported.

The application also provides a method for transmitting aperiodic CSI (A-CSI), wherein the UE receives an uplink authorization signaling; the UE determines whether to trigger an A-CSI report currently according to a CSI request domain in an uplink authorization signaling; and after the triggering of the A-CSI report is determined, the UE determines a CSI process to be updated and transmits A-CSI information on the uplink CC carrying the A-CSI report. Through the processing, more efficient transmission of the A-CSI information can be realized.

Drawings

Fig. 1 is a diagram of PUCCH format 3.

Fig. 2 is a schematic diagram of a basic flow of a UCI transmission method in the present application;

fig. 3 is a schematic diagram of PUCCH format X in the present application;

fig. 4 is a schematic diagram of a basic structure of a UCI transmission apparatus in the present application;

fig. 5 is a schematic diagram of a basic flow of an a-CSI transmission method according to the present application;

fig. 6 is a schematic diagram of a basic structure of an a-CSI transmitting apparatus according to the present application.

Detailed Description

For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

The transmission method of UCI is given in the present application and described below separately. First, a specific implementation of the UCI transmission method in the present application is given. Fig. 2 is a schematic diagram of a basic flow of a UCI transmission method in the present application. As shown in fig. 2, the method includes:

step 201, the user equipment UE receives the configuration signaling and determines an alternative PUCCH channel set corresponding to an ACK/NACK resource indication (ARI).

Specifically, the alternative PUCCH channel set is configured semi-statically in advance through signaling such as RRC, and the channel set corresponds to the ARI. When HARQ-ACK information needs to be fed back in one subframe, one PUCCH channel in the alternative PUCCH channel set can be dynamically indicated to be used for HARQ-ACK and other UCI transmission according to 2-bit ARI information in downlink authorization signaling.

Step 202, the UE receives the downlink grant signaling and the corresponding downlink data, and generates an HARQ-ACK bit.

The uplink grant signaling received by the UE includes ARI for indicating the PUCCH channel.

Step 203, the UE processes the UCI bits including the HARQ-ACK, determines a PUCCH channel for UCI bit transmission from the alternative PUCCH channel set according to the ARI included in the downlink grant signaling, and transmits the UCI bits on the determined PUCCH channel.

Embodiments of the present invention are described below.

Example one

In the CA system, PUCCH format 3 can only support transmission of UCI information of up to 22 bits. In order to support the feedback of UCI information of more bits on the PUCCH, a new PUCCH format, hereinafter referred to as PUCCH format X, needs to be defined. In this embodiment, a specific manner when UCI information is transmitted by using PUCCH format X is given, that is, an implementation method of step 203 when PUCCH format X is used in the flow shown in fig. 2.

The PUCCH format X channel may be extended based on PUCCH format 3. One possible approach is to still keep the OCC extension structure of PUCCH format 3 unchanged, i.e. the length of the OCC, and support more bits by increasing the number of PRBs occupied in the frequency domain, e.g. assuming that the extended channel occupies N PRBs, it can carry about 22N UCI bits. Another extension method is to keep the frequency domain still occupying one PRB, but reduce the length of the OCC, for example, using an OCC length of 2 to support more UCI bits. Alternatively, the number of occupied PRBs may be increased and the OCC length may be reduced at the same time, so as to support more UCI bits. The common feature of the three methods is that after the UCI bits are coded, Rate Matched (RM), scrambled and modulated, the modulation symbols are mapped to uplink Single Carrier Frequency Division Multiple Access (SCFDMA) symbols after OCC spreading.

As shown in fig. 3, it is assumed that UCI bits are equally divided into C after being channel-coded, RM, scrambled, and equally divided into C_muxPart, which can be represented as C_muxAnd (4) columns. Wherein, C_mux,0The columns are mapped to the uplink SCFDMA symbol of the first time slot after modulation and OCC expansion, C_mux,1The column is mapped to the uplink SCFDMA symbol of the second time slot after modulation and OCC expansion, C_mux,0+C_mux,1＝C_mux. In general C_mux,0And C_mux,1Equal or different by 1, thereby maximizing frequency diversity gain. Assuming that the length of OCC is equal to the number of SCFDMA symbols used to carry modulation symbols in a slot, C_mux,0＝C _mux,11. Assuming that the OCC length is less than the number of SCFDMA symbols used to carry modulation symbols in a slot, C_mux,0And C_mux,1And may be greater than 1. In fig. 3, the flow of encoding, RM and scrambling for only one UCI is shown, which may be representative of jointly encoding multiple different types of UCI; alternatively, by simple extension, separate encoding, RM and scrambling of multiple UCIs may be supported, which are then mapped together as C_muxAnd (4) columns. In FIG. 3, the division C_muxThe columns preceding the modulation block, or, dividing C_muxThe operation of the column may also be located after the modulation module.

Based on the PUCCH channel structure of LTE, the PRB positions mapped by one PUCCH format X channel in two slots of a subframe are mirror-image relative to the center frequency. Thus, the frequency can be obtained by combining the signals transmitted in the two time slotsDiversity gain. However, if only the signal in one slot is observed, there is substantially no frequency diversity effect because it is localized in one PRB. On the other hand, the UCI information is recorded as c_kK is 0,1,., K-1, K is the UCI bit number, the convolutional coding method of LTE is adopted, and the output bits corresponding to the three generator polynomials are respectively written as

And

rate Matching (RM) method with LTE, bit sequence

And

interleaving is respectively carried out, and then the RM circular buffer is obtained through cascading. I.e. the first K bits of the circular buffer correspond

Then K bits correspond

Last K bits correspond to

In this way, the output bits after the RM operation also maintain a similar structure, i.e., consecutive K are corresponding

Or

One of them. In order to correspond to K bits of each generator polynomial, i.e.

Or

The frequency diversity gain can be uniformly obtained, and the K bits should be uniformly mapped to the resources of two slots. According to the structure of PUCCH format X shown in fig. 3, one way to deal with this is to scramble the post-scrambling bit sequence q_kWriting (R)_mux×C_mux) Matrix, then read out column by column, front C_mux,0The column is mapped to the first slot, the last C_mux,1The column is mapped to a second slot; then, for each time slot, mapping on SCFDMA symbol after OCC spreading. Here, (R) is obtained from the number of SCFDMA symbols and OCC length of PUCCH format X_mux×C_mux) Number of columns C of matrix_muxAccording to PUCCH format X, the number of modulation symbols supporting transmission is recorded as H, and each modulation symbol can carry Q_mA physical bit, then (R)_mux×C_mux) Number of rows R of matrix_mux＝(H·Q_m)/C_muxAnd is R'_mux＝R_mux/Q_m. In FIG. 3, only R 'is shown'_muxLine of which each element y_kSubstantially represents a group including Q_mA column vector of rows. Suppose q_kLine by line writing (R)_mux×C_mux) Matrix, then

Or, assume q_kTo be provided withQ _mBehavior A group write by group (R)_mux×C_mux) Matrix, then

With this method, K bits for each generator polynomial are guaranteed, i.e. K bits are guaranteed

Or

Uniform mapping to pre-C_mux,0Column and post C_mux,1And the columns are further mapped to two time slots of the PUCCH format X channel, so that uniform frequency diversity gain is obtained, and the link performance of the PUCCH format X channel is improved.

Example two

In the embodiment, the processing method in the present application is provided when the UCI bits include HARQ-ACK and P-CSI information at the same time, that is, when the HARQ-ACK and P-CSI information need to be transmitted at the same time.

In the LTE system, when a UE needs to transmit multiple types of signals in an uplink subframe, multiple uplink channels are allocated accordingly. For example, assuming that P-CSI needs to be transmitted within one subframe, the base station semi-statically configures the UE with one channel for P-CSI. When the P-CSI is less than or equal to M bits, for example, M is equal to 11, the P-CSI may still be fed back using PUCCH format 2. When the number of bits of the P-CSI information is large, the P-CSI channel may be a PUCCH format X channel. Or, when the total number of P-CSI bits is less than or equal to N bits, e.g., N is equal to 22, the PUCCH format 3 channel may be configured for P-CSI; and when the total number of the P-CSI bits is more than N bits, the PUCCH format X channel is adopted.

In addition, when HARQ-ACK information needs to be fed back in one subframe, one PUCCH channel can be dynamically indicated for HARQ-ACK and other UCI transmission according to 2-bit ACK/NACK resource indication (ARI) information in downlink grant signaling. Here, 4 alternative PUCCH channels are semi-statically configured through RRC signaling, so that which PUCCH channel is used for UCI transmission is dynamically indicated with 2-bit ARI. This PUCCH channel may be a PUCCH format 3 channel, thereby supporting a maximum of 22-bit UCI transmission; alternatively, this PUCCH channel may also be a PUCCH format X channel, thereby carrying a larger UCI payload.

According to the above analysis, the PUCCH channel for P-CSI configured semi-statically by the base station only needs to consider the total number of bits of P-CSI, so the number of bits is small. For the PUCCH channel indicated by ARI, this channel may be all UCI bits (including HARQ-ACK and P-CSI, and may also include SR) requiring feedback within one subframe of one CG, so the PUCCH channel indicated by ARI needs to carry more bits. Thus, when P-CSI and HARQ-ACK need to be fed back in one subframe, the PUCCH channel allocated for P-CSI may not necessarily carry all UCI bits (including HARQ-ACK and P-CSI, and may also include SR), but the PUCCH channel indicated by ARI is necessarily available.

In order to maintain consistent UE operation under various different UCI feedback information combinations, the invention proposes that when the P-CSI and the HARQ-ACK need to be fed back simultaneously in one subframe (the SR can be further included), the UE feeds back the UCI information by using a PUCCH channel dynamically indicated by the ARI.

By adopting the method, no matter whether the semi-statically configured P-CSI channel is PUCCH format 2, PUCCH format 3 or PUCCH format X, the UE operates by using the PUCCH channel dynamically indicated by the ARI to feed back the UCI information, and the consistency of the UE operation is maintained. And when the PUCCH channel dynamically indicated by the ARI does not exist, feeding back the uplink information by using the semi-statically configured P-CSI channel. In addition, when the channel for configuring the P-CSI and the channel for dynamically indicating the ARI are of the same type, the ARI can have multiple values, so that the base station is allowed to dynamically adjust the allocation of the PUCCH channel according to the condition of the scheduled UE, and the flexibility of the base station in allocating the PUCCH channel is provided. Here, the base station may be implemented to enable the PUCCH channel with the P-CSI configured in the semi-static state to be one of alternative PUCCH channels with n bits ARI configured in the semi-static state, for example, n is equal to 2, so that the base station may flexibly select the PUCCH channel for UCI transmission through the ARI, and further avoid causing additional PUCCH overhead.

EXAMPLE III

In order to further reduce redundant bits of the ARI information and improve the resource utilization rate, a new ARI information bearing mode is provided in the application, and then the UE correspondingly extracts the ARI in the downlink authorization signaling according to the bearing mode so as to determine a PUCCH channel for transmitting UCI bits. By the method of the embodiment, the condition that the last downlink authorization signaling in the binding window is continuously lost can be effectively identified.

In the LTE system, HARQ-ACK information for downlink transmission of a plurality of downlink subframes of a plurality of CCs needs to be fed back within one uplink subframe. Here, the plurality of downlink subframes of the plurality of CCs are referred to as a bundling window corresponding to the uplink subframe. To help the UE identify whether one or more downlink transmissions within its bundling window are lost, Downlink Assignment Index (DAI) techniques are introduced in LTE systems. Specifically, the DAI is two-bit information, and is a pure counter for indicating how many downlink grant signaling are sent to the current subframe position. However, the 2-bit DAI information cannot find a case where consecutive 4 downlink grant signaling is lost, or a case where the last several downlink grant signaling are continuously lost. The two-bit DAI described above is a compromise between detection performance and signaling overhead. In other words, in the LTE system, the probability of losing 4 consecutive subframes is considered to be very low, and the de-optimization process is not required.

In addition, in the LTE system, when HARQ-ACK information needs to be fed back in one subframe, one PUCCH channel can be dynamically indicated for HARQ-ACK transmission according to 2-bit ACK/NACK resource indication (ARI) information in downlink grant signaling. Here, 4 alternative PUCCH channels are semi-statically configured through RRC signaling, thereby dynamically indicating which PUCCH channel to use for HARQ-ACK transmission with a 2-bit ARI.

According to the method in the existing LTE system, only the Transmission Power Control (TPC) domain of the downlink grant signaling with the DAI of Pcell equal to 1 is still used for power control, while other downlink grant signaling of Pcell and the TPC domain of the downlink grant signaling of Scell are both used as ARI. When considering configuring up to 32 carriers for a UE, especially for TDD systems, it results in more TPC fields in the downlink grant signaling being used as ARI information. However, in reality, all the ARI information is the same 2-bit information, which results in a large number of redundant bits.

The invention proposes that the ARI information and other control information (e.g. newly defined control information) can be processed together and mapped to the TPC domain of other downlink grant signaling except the TPC domain of the downlink grant signaling of the Pcell still used for power control. The other control information may be a channel indicating which PUCCH format is currently allocated, a total number of downlink grant signaling transmitted, a total number of TBs transmitted, or extension information as a DAI. As long as the UE can receive a certain number of the other downlink grant signaling, it is possible for the UE to complete the recovery of the ARI information and the other control information.

According to the above analysis, the design of the DAI of the LTE system cannot find the case of losing 4 consecutive downlink grant signaling, in other words, the case of losing 4 consecutive downlink grant signaling is not within the optimization range of the LTE system. Based on this property, it is possible to utilize the TPC field of the downlink grant signaling to carry more information. Here, the DAI may still be time domain, i.e. a count of downlink grant signaling for each subframe of one CC; alternatively, the DAI may be frequency domain, i.e. a count of downlink grant signaling for each CC within the same subframe; alternatively, the DAI may be used in both frequency and time domains, i.e., counting the downlink grant signaling of each CC in one subframe first, and then counting the downlink grant signaling of each CC in the next subframe continuously. Or, the DAI may be frequency domain, that is, count the number of TBs scheduled by the downlink grant signaling of each CC in the same subframe; or, the DAI may be jointly used in the frequency domain and the time domain, that is, the number of the scheduled TBs of the downlink grant signaling of each CC in one subframe is counted first, and then the number of the scheduled TBs of the downlink grant signaling of each CC in the next subframe is counted continuously.

One possible method is that, except that the TPC field of one downlink authorization signaling on the Pcell is still used for power control, the TPC fields in the first N other continuous downlink authorization signaling sent by the base station still indicate ARI information, and N is larger than N_minE.g. N_minEqual to 4; and the TPC field in the following other downlink authorization signaling is used for indicating other control information. Here, only when the UE loses the first N consecutive downlink grant signaling, the UE has no available ARI information, and such probability is very small and does not need to perform optimization processing. The following describes a method for processing the TPC field of other downlink grant signaling after the nth downlink grant signaling indicating the ARI.

The first processing method is to use these TPC domains to carry the currently scheduled downlink of the base stationThe total number of grant signalings. Further, the number of the downlink authorization signaling may be modulo N_minSo that log can be used₂(N_min) Bits are transmitted. E.g. N_minEqual to 4, is the total number of 2 bits used to transmit the currently scheduled downlink grant signaling. Based on the counted DAI in the downlink grant signaling, the UE can find that the loss is less than N except the loss of the last downlink grant signaling_minA case of continuous downlink grant signaling. Further, based on this method, the UE can determine whether he loses the last 1-N scheduled by the base station according to the total number of the downlink grant signaling transmitted in the TPC domain_min-1 downlink grant signaling. Thus, combining the total number of downlink grant signaling transmitted in DAI and TPC domains, the UE can find out that all the loss is greater than or equal to N_minA loss case other than one consecutive downlink grant signaling. According to the above analysis, when N is_min4 or more, there is no need to optimize the missing consecutive N_minAnd the situation of the downlink authorization signaling, the UE can deduce how many downlink authorization signaling are sent by the base station in total, and set the bit number of the HARQ-ACK correspondingly. The UE may further determine which PUCCH format PUCCH channel the ARI indicates according to the number of UCI bits carried by the current subframe. The UCI may include HARQ-ACK, P-CSI and/or SR.

By adopting the method, except that the TPC domain of the Pcell is still used for the downlink authorization signaling of power control, the UE is supposed to receive at least one downlink authorization signaling except the first N downlink authorization signaling indicating the ARI, namely the UE receives the total number of the currently scheduled downlink authorization signaling carried in the TPC domain, so that the UE can accurately obtain the total number of bits of the HARQ-ACK and transmit the HARQ-ACK information on the PUCCH channel indicated by the ARI according to the total number of the bits, wherein other UCI information can be simultaneously fed back on the PUCCH channel indicated by the ARI. Or, besides the TPC field of the Pcell is still used for the downlink grant signaling of power control, assuming that the UE receives only at least one of the first N downlink grant signaling indicating ARI, the UE still obtains ARI information to determine the PUCCH channel, but cannot know exactly the number of downlink grant signaling scheduled by the base station. The UE may determine the total number of HARQ-ACK bits according to the number of downlink grant signaling that it can detect or analyze. Or, in this case, the UE may also fix the number of bits for calculating HARQ-ACK according to the N downlink grant signaling scheduled by the base station, for example, the UE fixedly feeds back 2N HARQ-ACK bits.

At the base station side, when the base station actually schedules at least N + N_minWhen a downlink authorization signaling is carried out, loss of continuous N is not optimized_minOn the premise of the downlink authorization signaling, the UE must receive the total number of the currently scheduled downlink authorization signaling carried in the TPC domain, and the base station can assume that the UE accurately knows the total number of the HARQ-ACK bits, so blind detection is not needed. When the base station actually schedules more than N but less than N + N_minWhen signaling a downlink grant, the UE may lose the last N_min-1 downlink grant signaling, resulting in the UE failing to receive the total number of currently scheduled downlink grant signaling carried in the TPC field, and thus the UE may not know the exact HARQ-ACK number; or, when the base station actually schedules the downlink grant signaling less than or equal to N, that is, the base station fails to utilize the total number of currently scheduled downlink grant signaling carried in the TPC field, resulting in that the UE does not know the accurate HARQ-ACK number. At this time, if the operation of the UE determines the total number of HARQ-ACK bits according to the number of downlink grant signaling that can be detected or analyzed, the base station may perform blind detection on multiple possible total numbers of HARQ-ACK bits to complete the reception of HARQ-ACK; or, the base station receives the HARQ-ACK according to the HARQ-ACK bit number corresponding to the downlink data transmission actually scheduled by the base station. Or, if the UE does not receive the total number of currently scheduled downlink grant signaling carried in the TPC field, the number of bits for calculating HARQ-ACK is fixed according to N downlink grant signaling scheduled by the base station, for example, the UE fixedly feeds back 2N HARQ-ACK bits. The base station may need to blindly detect two payload sizes, that is, the number of HARQ-ACK bits and 2N bits corresponding to the actual scheduling of the base station.

The second approach is to use these TPC fields to carry the total number of TBs currently scheduled by the base station. Further, it may be modulo B of the total number of TBs_minSo that log can be used₂(B_min) Bits are transmitted. Such as B_minEqual to 8, log above₂(B_min) The bit information needs to be mapped to the TPC fields of multiple downlink grant signaling after being processed. From the DAI counting TBs in the downlink grant signaling, the UE has already found that the losses other than the last several TBs are successively smaller than B_minThe case of individual TB. Further, based on this method, the UE can determine whether he has lost the last 1-B scheduled by the base station based on this total number of TBs transmitted in the TPC field_min-1 TB. Thus, combining the total number of TBs transmitted in the DAI and TPC fields, the UE can find that all losses are greater than or equal to B_minLoss cases other than a single contiguous TB. According to the above analysis, there is no need to optimize the situation of losing 4 consecutive downlink grant signaling, when B_minWhen equals 8, lose B_minThe number of continuous TBs is equivalent to the number of lost continuous downlink grant signaling which is greater than or equal to 4, that is, optimization is not needed, so that the UE can deduce how many TBs the base station sends in total, and accordingly set the bit number of HARQ-ACK. The UE may further determine which PUCCH format PUCCH channel the ARI indicates according to the number of UCI bits carried by the current subframe. The UCI may include HARQ-ACK, P-CSI and/or SR.

By adopting the method, except that the TPC domain of the Pcell is still used for the downlink authorization signaling of power control, the UE is supposed to receive at least one downlink authorization signaling except the first N downlink authorization signaling indicating the ARI, namely the UE receives the total number of the currently scheduled TBs carried in the TPC domain, so that the UE can accurately obtain the total number of bits of the HARQ-ACK and carry out the HARQ-ACK transmission on the PUCCH channel indicated by the ARI according to the total number of the bits, wherein other UCI information can be simultaneously fed back on the PUCCH channel indicated by the ARI. Or, besides the TPC field of the Pcell is still used for the downlink grant signaling of power control, assuming that the UE receives only at least one of the first N downlink grant signaling indicating ARI, the UE still obtains ARI information to determine the PUCCH channel, but cannot know exactly the number of downlink grant signaling scheduled by the base station. The UE may determine the total number of HARQ-ACK bits according to the number of TBs it can detect or analyze. Or, in this case, the UE also fixes the number of bits for calculating HARQ-ACK according to the B TBs scheduled by the base station, for example, the UE fixedly feeds back B HARQ-ACK bits.

At the base station side, when the base station actually schedules at least N + N_minWhen a downlink authorization signaling is carried out, loss of continuous N is not optimized_minUnder the premise of the downlink authorization signaling, the UE must receive the total number of the currently scheduled TBs carried in the TPC domain, and the base station can assume that the UE accurately knows the total number of the HARQ-ACK bits, so blind detection is not needed. When the base station actually schedules more than N but less than N + N_minWhen signaling a downlink grant, the UE may lose the last N_min-1 downlink grant signaling, resulting in the UE failing to receive the total number of currently scheduled TBs carried in the TPC field, and thus the UE may not know the exact number of HARQ-ACKs; or, when the base station actually schedules less than or equal to N downlink grant signaling, that is, the base station fails to utilize the total number of currently scheduled TBs carried in the TPC field, resulting in that the UE does not know the accurate number of HARQ-ACKs. At this time, if the UE determines the total number of HARQ-ACK bits according to the number of TBs that the UE can detect or analyze, the base station may perform blind detection on multiple possible total numbers of HARQ-ACK bits to complete reception of HARQ-ACK; or, the base station receives the reception of the HARQ-ACK only according to the number of HARQ-ACK bits corresponding to the downlink data transmission actually scheduled by the base station. Or, if the UE does not receive the total number of currently scheduled TBs carried in the TPC field, the number of bits for calculating HARQ-ACK is fixed according to B downlink grant signaling scheduled by the base station, that is, the UE fixedly feeds back B HARQ-ACK bits. The base station may need to blindly detect two payload sizes, that is, the number of HARQ-ACK bits and B bits corresponding to the actual scheduling of the base station.

Example four

In this embodiment, a specific way of determining a PUCCH channel and a corresponding PUCCH format according to ARI information is given.

In the LTE system, HARQ-ACK information for downlink transmission of a plurality of downlink subframes of a plurality of CCs needs to be fed back within one uplink subframe. Here, the plurality of downlink subframes of the plurality of CCs are referred to as a bundling window corresponding to the uplink subframe. For the case where the reference HARQ timing is FDD timing, the bundling window includes resources of a plurality of CCs within one subframe; for the case of reference HARQ timing TDD timing, the bundling window includes resources within multiple subframes of multiple CCs. When the number of CCs on which the UE can be configured is large, the number of bits of HARQ-ACK is correspondingly large. For example, assuming that 32 CCs are configured and a bundling window of each CC includes 4 subframes, the number of bits of HARQ-ACK reaches 128 even in consideration of spatial bundling (spatial bundling).

However, in general, the base station does not schedule all subframes of all configured CCs within the bundling window to the same UE. In some cases, the base station may schedule only a few downlink data within the bundling window, and the number of effective HARQ-ACK bits is less than or equal to N1 bits, for example, N1 is equal to 22, and the UE should be allocated PUCCH format 3 channel when considering resource utilization. In other cases, the base station schedules more downlink data, which results in the number of effective HARQ-ACK bits being greater than N1, and needs to allocate PUCCH format X channel to the UE. Further, the PUCCH format X channel may also support multiple payload bit numbers, for example, when the number of HARQ-ACK bits that need to be fed back is greater than N1 but less than or equal to N2 bits, for example, N2 is equal to 66, the UE may process the PUCCH format X channel according to the case of carrying N2 bits; when the number of HARQ-ACK bits requiring feedback is greater than N2 bits, the UE may process PUCCH format X channel according to the case of carrying N3 bits, e.g., N3 equals 130. In order to optimize the transmission performance of the PUCCH as much as possible and improve the uplink resource utilization rate on the premise of ensuring the scheduling flexibility of the base station, the UE needs to dynamically switch the PUCCH channel to be used. For example, converting a PUCCH format 3 channel and a PUCCH format X channel with N1 bits as boundaries; or, converting the PUCCH format 3 channel, the PUCCH format X channel with a smaller payload, and the PUCCH format X channel with a larger payload, with N1 bits and N2 bits as boundaries.

Here, the present invention proposes that one value of ARI dynamically indicates PUCCH channel format for UCI transmission, and furtherThe PUCCH channel currently used by the UE is dynamically indicated. In particular, noting ARI is N bits of information, e.g., N equals 2, semi-statically configured 2 by RRC signaling^NAlternative, and configure these 2 respectively^NSeveral alternative PUCCH channel formats and corresponding PUCCH channels. The formats of the different alternative PUCCH channels may be the same or different. Then, the PUCCH channel format and PUCCH channel for UCI transmission may be dynamically indicated with an N-bit ARI in the downlink grant signaling. And the UE determines the PUCCH format and the used PUCCH channel according to the detected ARI information. With this approach, flexibility is provided for the base station to dynamically indicate the PUCCH format, but without increasing the number of ARI bits, it also means that the number of alternative channels for a particular PUCCH format is reduced.

The foregoing is a specific implementation of the UCI transmission method in the present application. The application also provides a device for transmitting the UCI, which can be used for implementing the UCI transmission method. Fig. 4 is a schematic diagram of a basic structure of the apparatus, and as shown in fig. 4, the apparatus includes: the device comprises a candidate PUCCH channel set determining unit, an HARQ-ACK bit generating unit, a UCI bit processing unit, a PUCCH channel determining unit and a transmitting unit.

The alternative PUCCH channel set determining unit is used for receiving the configuration signaling and determining an alternative PUCCH channel set corresponding to an ACK/NACK resource indication (ARI). And the HARQ-ACK bit generating unit is used for receiving the downlink authorization signaling and the corresponding downlink data and generating HARQ-ACK bits. And the UCI bit processing unit is used for processing the UCI bits including the HARQ-ACK. And the PUCCH channel determining unit is used for determining a PUCCH channel used for UCI bit transmission from the alternative PUCCH channel set according to the ARI included in the downlink authorization signaling. And a sending unit, configured to transmit UCI bits including HARQ-ACK on the determined PUCCH channel.

The following is directed to a method and apparatus for transmitting a-CSI in UCI information. Fig. 5 is a basic flowchart of a method for transmitting a-CSI information according to the present application. As shown in fig. 5, the method includes:

step 501, the UE receives an uplink grant signaling.

Step 502, the UE determines whether to trigger an a-CSI report currently according to the CSI request field in the uplink grant signaling.

Step 503, after determining to trigger the a-CSI report, the UE determines the CSI process to be updated, and transmits the a-CSI information on the uplink CC carrying the a-CSI report.

The following describes specific transmission modes of a-CSI by two specific embodiments.

EXAMPLE five

In LTE systems, a-CSI reporting may be triggered and transmitted mapped onto a PUSCH channel. The uplink grant signaling contains a 1-bit or 2-bit CSI request field, which is used for triggering the A-CSI report of the UE. Taking a 2-bit CSI request field as an example, a value of "0, 0" indicates that a-CSI is not triggered; the value "0, 1" indicates the a-CSI of the downlink CC corresponding to the uplink CC scheduled by the uplink grant signaling, where the correspondence is determined according to the system information block SIB 2; the values "1, 0" and "1, 1" specifically trigger those CSI reports to be configured with RRC signaling, so it is possible to configure the a-CSI triggering any one CC with maximum flexibility. However, for the value "0, 1", because the typical CA configuration is asymmetric, only those downlink CCs configured with the corresponding uplink CC can trigger the a-CSI with the value "0, 1". In particular, the UE may be configured with 32 downlink CCs and only 1 uplink CC, which greatly limits the availability of the value "0, 1".

In order to fully utilize the value "0, 1", the present embodiment proposes that for a CC only configured for downlink transmission, the UE is still required to detect DCI format 0, so that the UE is triggered to report the a-CSI on such a CC only configured for downlink transmission by using DCI format 0. Here, the UE does not increase the number of blind detections when detecting DCI format 0, because the bit numbers of DCI format 0 and DCI format 1A are equal, and the UE will detect the DCI format when blindly detecting the downlink grant signaling for scheduling downlink transmission.

Here, since only the CC configured for downlink transmission cannot actually perform uplink transmission, the triggered a-CSI information can only be on other CCs configured for uplink bandwidth. This CC may be fixed to Pcell; or, the CC may be a CC, i.e. a PScell, corresponding to a feedback UCI of the CC configured with only downlink transmission; alternatively, some bits of DCI format 0 may be redefined to instruct the UE to select one of a plurality of configured uplink CCs for a-CSI feedback.

The DCI format 0 corresponding to the CC configured only with downlink transmission may be used to trigger a-CSI only, or may also trigger uplink data transmission on the CC configured only with downlink transmission and scheduling feedback a-CSI at the same time.

The DCI format 0 corresponding to the CC configured only for downlink transmission may only have a value "0, 1" for triggering a-CSI, or may also have values "0, 1", "1, 0" and "1, 1" for triggering a-CSI. For the values "0, 1", "1, 0" and "1, 1", the CSI processes corresponding to the triggered a-CSI are configured by higher layer signaling, and may be the same as or different from the configuration of other CCs supporting uplink transmission.

The DCI format 0 corresponding to the CC configured only for downlink transmission may still only have two bits for CSI request, or may also use more bits for CSI request, so that more different sets of a-CSI information may be configured by RRC signaling. For example, if DCI format 0 configuring only downlink CCs does not schedule uplink data, some fields in the DCI format are useless and may be used to increase the number of bits of the CSI request.

When the A-CSI is triggered by using DCI format 0 of the CC only configured with downlink transmission and the UE does not schedule uplink data transmission on the CC feeding back the A-CSI, determining relevant parameters of a PUSCH channel of the CC feeding back the A-CSI according to the DCI format 0 and transmitting the A-CSI. When the A-CSI is triggered by the DCI format 0 of the CC which is only configured with downlink transmission, and the UE schedules uplink data transmission on the CC which feeds back the A-CSI, but the A-CSI report is not additionally triggered on the CC which feeds back the A-CSI, the relevant parameters of the PUSCH are determined according to the uplink authorization signaling of the CC which feeds back the A-CSI, and then the A-CSI triggered by the DCI format 0 of the CC which is only configured with downlink transmission is transmitted on the PUSCH. When the A-CSI is triggered by using a DCI format 0 of a CC which is only configured with downlink transmission, and the UE detects an uplink authorization signaling and additionally triggers the A-CSI in the CC which feeds back the A-CSI, namely the UE receives at least two A-CSI triggers in one subframe at the same time, the UE can consider that the condition is a configuration error; or, the UE may transmit only the a-CSI triggered by the uplink grant signaling of the CC feeding back the a-CSI, that is, the a-CSI triggered by the DCI format 0 of the CC configured with only the downlink transmission is discarded; alternatively, the UE may only need to transmit once for feeding back two a-CSI reports simultaneously, in particular the UE may be a union feeding back two a-CSI, i.e. for a repeated CSI process of two a-CSI.

EXAMPLE six

In LTE systems, a-CSI reporting may be triggered and transmitted mapped onto a PUSCH channel. The uplink grant signaling contains a 1-bit or 2-bit CSI request field, which is used for triggering the A-CSI report of the UE. Taking a 2-bit CSI request field as an example, a value of "0, 0" indicates that a-CSI is not triggered; the value "0, 1" indicates the a-CSI of the downlink CC corresponding to the uplink CC scheduled by the uplink grant signaling, where the correspondence is determined according to SIB 2; the values "1, 0" and "1, 1" specifically trigger those CSI reports to be configured with RRC signaling, so it is possible to configure the a-CSI triggering any one CC with maximum flexibility.

In addition, in the LTE system, a plurality of Cell Groups (CGs) may be configured for the UE, and for one CG, UCI information of each Cell of the CG is fed back on one Cell of the CG. In particular, it may be a CSI process set that configures a-CSI reporting separately with RRC signaling for each CG, and triggers a-CSI reporting separately for the UE with uplink grant signaling. However, from the UE capability, the number of CSI processes that the UE can update and feed back a-CSI in one subframe is constant, denoted as K CSI processes, regardless of whether multiple CGs are configured. For each CG, the A-CSI reports triggered by the CSI request domain are configured independently, namely, for one CG, the A-CSI reports containing at most K CSI processes are allowed to be configured by one code word corresponding to the CSI request domain. This may result in the total number of CG-triggered CSI processes may exceed the UE's ability to update and feedback a-CSI when the base station triggers a-CSI reports within multiple CGs within the same subframe. At this time, one approach is to let the UE think it is a configuration error, but this causes a limitation to the base station triggering a-CSI. Another approach is to rely on UE implementation to handle this case. Since different manufacturers may have different implementation methods, this causes the base station to be uncertain which K CSI processes the UE has reported at all are up to date, which also does not facilitate base station scheduling. In fact, in some cases, the base station may intentionally make the total number of a-CSI processes triggered by multiple CGs in one subframe greater than K, and only needs to define a certain priority rule to control the UE to update only a part of the a-CSI of the high-priority CGs; or, the UE is controlled to update only the CSI processes with higher priorities of the CGs, and the set of the CSI processes which can be updated is not configured through RRC signaling, so that the number of the sets of the triggering A-CSI is increased under the condition of not changing the RRC signaling.

In this embodiment, when the base station triggers a plurality of CGs of a-CSI in one subframe, and the total number of triggered CSI processes is greater than the capability K of the UE to update and report a-CSI, it is noted that the total number of triggered CSI processes is N, and the UE selects K CSI processes with the highest priority from the N CSI processes to update and report the CSI.

For CSI information, the priority can be handled from several aspects as follows.

For the A-CSI, the design principle is that the CSI information is fed back once, that is, all related CQI/PMI information is reported under the condition that RI information is defaulted to a specific value, for example, RI is equal to 1; alternatively, the UE needs to report RI information and all CQI/PMI information on one PUSCH. Thus, the method of distinguishing the two CSI report types RI and CQI/PMI cannot be directly applied to a-CSI. A simple approach is not to use the CSI report type as a basis for a-CSI priority. Or, the priority of the CSI process for simultaneously feeding back the RI and the CQI/PMI is higher than that of the CSI process which adopts the default RI and only feeds back the CQI/PMI. Alternatively, it may be a priority that defines various CSI reporting modes for a-CSI. Alternatively, it may be a priority that defines various downlink transmission modes.

The CSI process ID may still be used as a basis for determining the a-CSI priority. For example, CSI processes with smaller CSI process IDs take precedence. For TM 1-9, the LTE system does not define CSI processes, but can process as if only one CSI process is configured and the CSI process ID is 0.

For the cell ID, there may be two defining methods. The first method is that all configured CCs of the UE are respectively configured with a unique cell ID, so that priorities of CSI processes of different CGs can be determined according to the cell IDs, and because the cell IDs of different CGs are different, a CSI process with a higher priority can be selected without comparing other parameters. Or, the second method is to configure the cell ID to be the index of the cell in one CG, that is, the cells in different CGs may have the same cell ID for a-CSI priority, so that when the cell IDs of the CSI processes in two CGs are the same, the CSI subframe set indexes may be further compared, for example, the CSI process with the smaller CSI subframe set index is prioritized; alternatively, when the cell IDs of the CSI processes in the two CGs are the same, the CG indexes may be further compared, for example, the CSI process with the smaller CG index takes precedence; or, both the CSI subframe set index and the CG index may be further used as priority criteria.

The CG index may be used as a basis for determining the priority of the a-CSI. For example, CSI processes with smaller CG indices take precedence. By adopting the method, the highest priority of the CG where the Pcell is located can be realized, so that the downlink transmission performance of the CG where the Pcell is located is protected.

Assuming that a CG can further divide a plurality of feedback a-CSI subgroups, that is, an a-CSI triggered a-CSI is limited to a CC in a subgroup, the index of the a-CSI subgroup can be used as a basis for determining the priority of the a-CSI. For example, CSI processes with smaller indices of the a-CSI sub-group take precedence. Here, all a-CSI sub-groups may be ordered together across CGs so that priority must be given according to the a-CSI sub-group index. Here, it is generally necessary to guarantee that the a-CSI sub-set within the CG where the Pcell is located has a lower index. Or the index of the a-CSI sub-group is defined inside each CG, i.e., the indexes of the a-CSI subframes within the CGs may be equal.

In order to guarantee downlink transmission performance of the CC for carrying UCI information as much as possible, a priority order may be defined, that is, priority of Pcell > priority of PScell > priority of other scells. Here, if there are multiple pscells, the priorities are considered to be the same, and if there are multiple other scells, the priorities are also considered to be the same; or, if there are multiple pscells, sorting may be further performed according to their indexes; if there are multiple other scells, they are sorted by their index.

The licensed band or the unlicensed band in which the cell is located may be used as a criterion, for example, the cell priority of the licensed band is higher than that of the unlicensed band, since the CSI measurement of the cell of the licensed band is definitely available, but for the cell of the unlicensed band, even if the a-CSI report is triggered, if the cell does not possess the channel for a long time, the a-CSI effectiveness is low. Alternatively, a cell with a higher priority in the unlicensed frequency band than a cell in the licensed frequency band may be defined, because if the one-time CSI report of the unlicensed frequency band cannot be reported and utilized in time, the base station may not have CSI information available for a long time, and the CSI report on the licensed frequency band may be reported frequently, that is, there are more opportunities for reporting.

By adopting the method of the invention, when the number of the CSI processes of the A-CSI triggered by the base station at the plurality of CG is larger than K, the UE determines and updates the CSI information of the K CSI processes according to the priority rule. Since this priority rule works on both the base station and the UE, without uncertainty, the UE may transmit only the a-CSI information corresponding to the K CSI processes in the uplink direction, i.e. one a-CSI report corresponding to one CG, only the CSI information belonging to the K highest priority CSI processes is retained, and accordingly the total number of bits of the a-CSI information is determined and transmitted on the uplink channel of the a-CSI report corresponding to this CG accordingly. By adopting the method, the invalid bit of the A-CSI which is not updated is removed, the influence on the transmission of general uplink data is reduced, and the utilization rate of uplink resources is improved.

While various parameters are described above for processing a-CSI priorities separately, the actual priority criterion may be the joint use of one or more of the above-described parameters of priorities. For example, four parameters are adopted and the priority levels are in order from high to low, that is, CSI report type > CSI process ID > cell ID > CSI subframe set index. In the case of using a plurality of parameters in combination, only when the high-level parameter cannot determine the priority, the lower-level parameter is further compared.

The foregoing is a specific implementation of the transmission method of a-CSI in the present application. The application also provides a device for transmitting the A-CSI. Fig. 6 is a schematic diagram of a basic structure of the apparatus, and as shown in fig. 6, the apparatus includes: the device comprises a receiving unit, an A-CSI report triggering unit and a transmission unit.

The receiving unit is used for receiving the uplink authorization signaling. And the A-CSI report triggering unit is used for determining whether to trigger the A-CSI report currently according to the CSI request domain in the uplink authorization signaling and notifying the transmission unit when the A-CSI report is determined to be triggered. And the transmission unit is used for determining the CSI process to be updated and transmitting the A-CSI information on the uplink CC carrying the A-CSI report after receiving the trigger notice of the A-CSI report trigger unit.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for transmitting Uplink Control Information (UCI), comprising:

user Equipment (UE) receives the configuration signaling and determines an alternative PUCCH channel set corresponding to the response ACK/NACK resource indication;

UE receives a downlink authorization signaling and corresponding downlink data and generates a hybrid automatic repeat request (HARQ) -ACK bit;

the UE processes UCI bits including HARQ-ACK, determines a PUCCH channel for UCI bit transmission from the alternative physical uplink control channel PUCCH channel set according to ACK/NACK resource indication included in the downlink authorization signaling, and transmits the UCI bits on the determined PUCCH channel;

wherein when P-CSI is included in the UCI bits, the UCI bits including the P-CSI are transmitted on a PUCCH channel indicated by the ACK/NACK resource indication.

2. The method of claim 1, wherein when the UCI bits are transmitted on a PUCCH format X channel, the UE processing and transmitting the UCI bits on a PUCCH channel comprises:

the UCI bit is written after being coded, rate matched RM, scrambled_mux×C_mux) Matrix, then read out column by column, and read out the front C_mux,0Column mapping to the first slot, C, of the PUCCH format X channel_mux,1Column mapping to a second slot of the PUCCH format X channel; then, for each time slot, mapping the time slot to a Single Carrier Frequency Division Multiple Access (SCFDMA) symbol after being spread by an orthogonal spreading code (OCC);

3. The method of claim 1, wherein uplink information is fed back by using a semi-statically configured P-CSI channel when there is no PUCCH channel indicated by ACK/NACK resource indication.

4. The method of claim 1, wherein the determining the PUCCH channel according to the ACK/NACK resource indication comprises: processing the ACK/NACK resource indication information and other control information together, and mapping the ACK/NACK resource indication information and other control information to TPC domains of other downlink authorization signaling except the transmission power control TPC domain of the downlink authorization signaling still used for power control of the Pcell; and determining the PUCCH channel according to the ACK/NACK resource indication information mapped on the corresponding TPC domain.

5. The method of claim 4, wherein the mapping of the ACK/NACK resource indication information and other control information comprises: the TPC domain of one downlink authorization signaling on the Pcell is still used in other downlink authorization signaling except for power control, the TPC domain in the first N continuous downlink authorization signaling sent by the base station is used for mapping ACK/NACK resource indication information, and the TPC domain in the remaining downlink authorization signaling is used for mapping the other control information; wherein N is an integer of 4 or more.

6. The method of claim 5, wherein the TPC field in the remaining downlink grant signaling is used for mapping the other control information, comprising:

7. The method of claim 6, wherein the total number of downlink grant signaling or the total number of TBs is counted in a time domain, a frequency domain, or a combination of the time domain and the frequency domain.

8. The method of claim 1, wherein the determining the PUCCH channel according to the ACK/NACK resource indication comprises:

the UE determines a PUCCH channel according to the ACK/NACK resource indication information and selects a PUCCH format according to the bit number of UCI; or,

the UE determines a currently used PUCCH format and a corresponding PUCCH channel according to the value indicated by the ACK/NACK resource; and the formats of different alternative PUCCH channels in the alternative PUCCH channel set are the same or different.

9. The method of claim 8, wherein the determining, by the UE, the currently used PUCCH format and the corresponding PUCCH channel according to the value indicated by the ACK/NACK resource includes:

judging whether the bit number of the UCI is equal to 22 or not, if so, determining a first alternative PUCCH resource set corresponding to a first preset PUCCH format according to the configuration signaling; otherwise, determining a second alternative PUCCH resource set corresponding to a second preset PUCCH format according to the configuration signaling;

and determining a PUCCH channel in the first alternative PUCCH resource set or the second alternative PUCCH resource set according to the information of the TPC domain in the downlink authorization signaling.

10. An apparatus for transmitting Uplink Control Information (UCI), comprising: the device comprises an alternative PUCCH channel set determining unit, an HARQ-ACK bit generating unit, a UCI bit processing unit, a PUCCH channel determining unit and a transmitting unit;

the alternative PUCCH channel set determining unit is used for receiving the configuration signaling and determining an alternative PUCCH channel set corresponding to the ACK/NACK resource indication;

the UCI bit processing unit is used for processing UCI bits including HARQ-ACK;

the PUCCH channel determining unit is configured to determine a PUCCH channel for UCI bit transmission from the candidate PUCCH channel set according to an ACK/NACK resource indication included in the downlink grant signaling; wherein when P-CSI is included in the UCI bits, the UCI bits including the P-CSI are transmitted on a PUCCH channel indicated by the ACK/NACK resource indication;

11. The apparatus of claim 10, wherein when the UCI bits are transmitted on a channel of PUCCH format X,

the UCI bit processing unit processing the UCI bits comprises: encoding, rate matching RM and scrambling UCI bits;

the transmitting unit transmitting the UCI bits on the determined PUCCH channel includes: writing (R) the information processed by the UCI bit processing unit_mux×C_mux) Matrix, then read out column by column, and read out the front C_mux,0Column mapping to the first slot, C, of the PUCCH format X channel_mux,1Column mapping toA second slot of the PUCCH format X channel; then, for each time slot, mapping the time slot to a Single Carrier Frequency Division Multiple Access (SCFDMA) symbol after being spread by an orthogonal spreading code (OCC);

12. The device of claim 10, wherein the PUCCH channel determining unit is configured to determine a semi-statically configured P-CSI channel as the PUCCH channel for feeding back uplink information when there is no PUCCH channel indicated by ACK/NACK resource indication.

13. The apparatus of claim 10, wherein the PUCCH channel determining unit determines the PUCCH channel according to the ACK/NACK resource indication includes: processing the ACK/NACK resource indication information and other control information together, and mapping the ACK/NACK resource indication information and other control information to TPC domains of other downlink authorization signaling except the transmission power control TPC domain of the downlink authorization signaling still used for power control of the Pcell; and determining the PUCCH channel according to the ACK/NACK resource indication information mapped on the corresponding TPC domain.

14. The apparatus of claim 13, wherein the mapping of the ACK/NACK resource indication information and other control information comprises: the TPC domain of one downlink authorization signaling on the Pcell is still used in other downlink authorization signaling except for power control, the TPC domain in the first N continuous downlink authorization signaling sent by the base station is used for mapping ACK/NACK resource indication information, and the TPC domain in the remaining downlink authorization signaling is used for mapping the other control information; wherein N is an integer of 4 or more.

15. The apparatus of claim 14, wherein the TPC field in the remaining downlink grant signaling is used to map the other control information, comprising:

16. The apparatus of claim 15, wherein the total number of downlink grant signaling or the total number of TBs is time-domain counted, frequency-domain counted, or combined time-domain and frequency-domain counted.

17. The apparatus of claim 10, wherein the PUCCH channel determining unit determines the PUCCH channel according to the ACK/NACK resource indication includes:

the PUCCH channel determining unit determines a PUCCH channel according to the ACK/NACK resource indication information and selects a PUCCH format according to the bit number of UCI; or,

the PUCCH channel determining unit determines a currently used PUCCH format and a corresponding PUCCH channel according to the value indicated by the ACK/NACK resource; and the formats of different alternative PUCCH channels in the alternative PUCCH channel set are the same or different.

18. The apparatus according to claim 17, wherein the determining, by the PUCCH channel determining unit, a PUCCH format currently used and a corresponding PUCCH channel according to the value of the ACK/NACK resource indication includes:

19. A method for transmitting aperiodic CSI (channel state information), A-CSI, comprising:

user Equipment (UE) receives an uplink authorization signaling;

20. The method of claim 19, wherein the determining whether to trigger the a-CSI report according to the CSI request field in the uplink grant signaling comprises: for the CC only configured with downlink transmission, the UE determines whether to trigger an A-CSI report by detecting a DCI format 0; the CSI request field of DCI format 0 is used to trigger an a-CSI report of a CC configured only for downlink transmission by a UE.

21. The method of claim 20, wherein for a CC only configured for downlink transmission, when determining to trigger an a-CSI report according to the DCI format 0, the uplink CC carrying the a-CSI report is: and the uplink CC indicated by the specified bit in the PCell, the PScell or the DCI format 0.

22. The method of claim 20, wherein for CCs for which downlink transmission is configured only:

23. The method of claim 19, wherein the determining the CSI processes to update comprises:

24. The method of claim 23, wherein determining priorities for different CSI processes comprises:

the priority of the CSI process of the licensed frequency band cell is higher than that of the CSI process of the unlicensed frequency band cell, or the priority of the CSI process of the unlicensed frequency band cell is higher than that of the CSI process of the licensed frequency band cell.

25. The method of claim 23, wherein when the K highest priority CSI processes are selected, only CSI information of CSI processes belonging to the K highest priority CSI reports corresponding to one CG are retained, and the total bit number of a-CSI information is determined according to the CSI information.

26. An apparatus for transmitting aperiodic CSI information a-CSI, comprising: the device comprises a receiving unit, an A-CSI report triggering unit and a transmission unit;

the receiving unit is configured to receive an uplink grant signaling;

27. The apparatus of claim 26, wherein the a-CSI report triggering unit determines whether to trigger a-CSI report currently according to a CSI request field in uplink grant signaling comprises: for the CC only configured with downlink transmission, the UE determines whether to trigger an A-CSI report by detecting a DCI format 0; the CSI request field of DCI format 0 is used to trigger an a-CSI report of a CC configured only for downlink transmission by a UE.

28. The apparatus of claim 27, wherein for a CC only configured for downlink transmission, when determining to trigger an a-CSI report according to the DCI format 0, the uplink CC carrying the a-CSI report is: and the uplink CC indicated by the specified bit in the PCell, the PScell or the DCI format 0.

29. The apparatus of claim 27, wherein for CCs for which downlink transmission only is configured:

30. The apparatus of claim 26, wherein the transmission unit determines the CSI process to be updated comprises:

31. The apparatus of claim 30, wherein determining priorities for different CSI processes comprises:

32. The apparatus of claim 30, wherein when the K highest priority CSI processes are selected, only CSI information of CSI processes belonging to the K highest priority CSI reports corresponding to one CG are retained, and a total bit number of a-CSI information is determined according to the CSI information.